Typewriting machine



July 25, 1944. w E HELMOND 2,354,520 I TYPEWRITlNG MACHINE Filed Dec 30,1940 5 Sheets-Sheet l 570p SETT/IVG INVENTOR W/ZZ/AM F. HAL/VON!)ATTORNEY y 25, 1944- w. F. F lELMOND 2,354,520.

TYPEWRITING MACHINE Filed Dec. 30, 1940 5 Sheets-Sheet 2 INVENTORW/LL/A/V l: HEL/VU/Vfl ATTORNEY 7 July 25, 1944. w. F. HELMONDTYPEWRITING MACHINE 5 Sheets-Sheet 3 Filed Dec.

m m I iiwwizz INVENTOR W/LL/AM 1 HEL/VO/VD BY IIIIIIIIIIA.

T ww ATTORNEY July 25, 1944. w. F. HELMOND TYPEWRITlNG MACHINE FiledDec.

30, 1940 5 Sheets-Sheet 4 INVENTOR W/LL/AM EHELMO/VD ATTO R N EY July25, 1944. W. F, 'H ELM'OND 2,354,520

TYPEWRIIlNG MACHINE Filed Dec. 30, 194o 5 Sheets-Sheet 5 INVENTOR hlLL/AM f. HEL MONO BY i K y v ATTORNEY Patented July 25, 1944TYPEWRITING- MACHINE William F. Helmond, Clinton, Conn., assignor toUnderwood Elliott Fisher Company, New York, N. Y., a corporation ofDelaware Application December 30, 1940, Serial No. 372,297

29 Claims. ,(Cl. 197-63) This invention relates to key-settable marginstop mechanisms for typewriting machines, and more particularly tomechanismsof this character having provision for typing beyond eachmargin.

One of the objects of the invention is to provide a key-settablemargin-stop mechanism having a simple and reliably operativemargin-release device adapted upon actuation of a control key to releasethe carriage from within the normal line-typing limits, for typingbeyond either margin, and adapted to be automatically reconditioned forthe normal margin gaging of a typing line by merely returning thecarriage to with in the line-typing range.

A further object is to provide a margin-release mechanism which isnormally locked against release in all line-typing positions of thecarriage, thereby to forestall unintentional margin release which wouldrender the margin-stop mechanism temporarily ineffective for normalmargin gaging.

Another object is to provide, in association with a margin-gagingmechanism having provision for automatically restorable margin'releaseand having letter-spaced carriage stops of identical form adapted tofunction either as left or right margin stops, an improved stop settingmechanism rendering a set stop effective for either right or left margingaging.

A further object is to provide a safety device associated with thekey-operable stop setting mechanism to prevent damage to the mechanismwhich would otherwise result when the setting mechanism is forcefullyoperated with the carriage banked at the line-start position.

The invention in certain respects constitutes an improvement on the onedescribed and claimed in my copending application Serial No. 341,420,filed June 20, 1940, now Patent No. 2,316,865, dated April 20, 1943, andis also an improvement on the mechanism shown in the U. S. patent toDobson, No. 2,196,790, dated April 9, 1940.

Improvements over the present invention'are described and claimed in acopending application of Newberry, filed April 21, 1942, now U. S.Patent No. 2,341,470 issued February 8, 1944.

In the physical embodiment of the invention illustrated, a series ofkey-settable stops identical in form are arranged at letter-spaceintervals on the carriage and are settable from a normal, ineffectiveposition on the stop rack to an effective position engageable with acounterstop. A key operated stop setter is adapted to set any one of thestops positioned thereat by carriage ting station so that the stop beingset serves to gage the line-end position of the carriage. Thestop-setting mechanism includes a safety device to prevent damage to themechanism when forcefully operated to set a right-hand stop with a leftstop banked against the counterstop, the safety device yielding to'allowthesettingmechanism to move idly without damage-to the working parts.Margin-release mechanism is provided which, upon operation of a releasekey, re tracts the counterstop from its normally eifec tive position,thereby releasing the carriage for typing in either margin. A normallydisabled latching device, conditioned for operation by depressing therelease key, is rendered effective by relative movement of thecounterstop and carriage with the latter banked at either margin. Inthat to effectively set the latching device requires relative movementof the carriage and counterstop, unintentional margin release whichwould render the stop mechanism" temporarily ineffective for normalmargin-gaging is prevented. Said latching device holds'the counterstopretracted during in-the-margin typing and is released automatically, tofree the counterstop for its normal margin-gaging function, by movementof the carriage to within-the-line-typing zone defined by the set marginstops.

In the drawings:

Figure 1 is a front elevational view of the margin-stop mechanism of theinvention, in the condition of normal line typing, omitting the stoprestoring element to facilitate illustration.

Figure 2 is a sectional view taken on a foreand-aft plane of thetypewriter, showing the margin-stop mechanism in side elevation.

Figure 3 is a fragmentary plan view taken on line 33 of Figure 2.

Figures 4 and 5 illustrate the condition of the mechanism in setting astop for either left or right margin gaging, Figure 4-showing a stop setto define the beginning of a .line, and Figure'5 showing the stop setfor line-end gaging.

Figure 6 shows the condition of the mechanism with the carriage bankedat the beginning-ofline position, or preparatory to release for typingin the left margin. 7 4

Figure 7 shows the mechanism in operated condition for typing in theleft margin,

Figure 8 illustratesthe condition'of the 'mech-i begun typing in theright-hand margin.

tion following the Figure 10 showing, after having Figure 12demonstrates the action in'restoringj I the mechanism from marginrelease for the usual typing between the margin-gaging stops. Figure 13shows the operation of the safety deanism when operated to set aright-hand stop" with a left stop banked against the counterstop, and

1 Figure 14 is an exploded perspective view of the counterstop andother-elements directly associated therewith, also showing the stopsetter. Referring to thedrawings for a more detailed descriptionthereof, and particularly to Figures 1 and 2, the typewriting machineforming the em-' keys, not shown, for actuating type bars to strike aplaten 2| on' the carriage. The carriage is actuated in letter-feeddirection by the, usual spring drum, not shown, under control of anescapement mechanism 22; the wheel 23 of which may be geared tothecarriage by a pinion 24 and carriage rack 25. The carriage may beadvancedv step by step in the conventional manner by the type barsengaging a universal bar 26 connected to a rockable bail 2'! pivoted at28 and having an-operative connection 30 to an escapement dog carrier 3|cooperating with the wheel 23 in the During each type bar well-knownmanner. stroke, the carriage is advanced a letter space in line-typingvdirection so that the type characters are successively imprinted in atyping line on the work sheet supported on the platen, I

A series of margin stops 34, identical in form throughout the range ofcarriage travel, are arranged at letter-space intervals on the carriageand are supported by a rack bar 35 secured at each'end to the carriage.Each stop 34 is slidable in the rack bar for position adjustment from anormal, ineffective setting to a projected position at which the lowerend of the stop is disposed to engage va counterstop 36 during carriagetravel. A detent springis provided to yieldably hold the stop at eitherof said positions. The stop rack organization may be of any suitablearrangement such as that shown and described in my Patent No. 2,146,821,dated February 14, 19 39. n bracket 31, securedto the rear trackway H,or other fixed member, of the machine, supports a pivot 38 providing apivotal mounting for the counterstop 36 and other elements hereinafterdescribed. The pivot 38 includes a screw 46 and a collar 4| threadedthereon, mounted on the bracket 31 as shown in Figures. 2 and 14. Thecounterstop 36 has a slotted portion 42 engaging the pivot 38, allowingthe counterstop to swing laterally and moveup and down, a spring 43yieldablyholding the counterstop norma :cooperative with mechanismhereinafter described. A sprin 41, assisted by spring 43, urges theupper portion of the shift lever and the counterstop rightward to itsnormal position as defined by the engagement of the lu 45 with 1 oneside of a guide slot 48 in a cover plate 50. vice in yielding to preventdamage to the mech- ,7

t The stop-setting mechanism is so organized that any stop 34 positionedby carriage movement at the stop-setting station may be set for eitherrightor left-hand margin gaging. Two stop setting keys 5|, 52 arearranged adjacent the type keyboard of the machine for settingrespectively the left margin and right margin stops, see Figure 1.Operation of either key 5| or 52, causes a stop setter 53 to be pulleddownwardly so that a finger 54 thereon, in position at thestopsettingstation, projects the one stop 34 of the series at saidstation. The key 5| for setting a stop for left-hand margin gaging, iscarried on a key lever 55 fulcrumed on a comb bar 56 and engageable withan intermediate lever 5! at 58. Figure 2. A bracket 60 on the bar 56carries a stud 6| on which lever 51 is fulcrumed. Lever 51 is flexiblyconnected to the lower end of the stop setter 53 at 62, see Figures 4and 5.

The key 52 for setting a stop for right-hand margin gaging, is carriedon a key lever 63 pivoted on the comb bar 56 and is engageable with anintermediate lever 64 fulcrumed on the stud 6|, said lever having a slot65 riding on said stud. A spring 66 acting on lever 64 yieldably holdssaid lever in a rightward position with the left end of slot 65 againstthe stud 6|. The free end of lever 64 carries a roller 61 adapted tocoact with the cam 46 of the shift lever 44. The slot 65 extends fromthe stud 6| in a direction substantially at right angles to the generalcontour of the cam 46.

It may be here noted that the arrangement of the stop-setting finger 54allocates the setting station just to the left of the counterstop in itsnormal position. To set a stop for left-hand margin gaging, the key 5|is depressed and the intermediate lever 51 pulls the stop setter downand thus sets a stop at the left side of the counterstop, see Figure 4.In setting a stop for righthand margin gaging, the key 52 is depressedand the intermediate lever 64 is, therefore, actuated. Said leverengages a pin 68 on lever 51 and thus pulls the stop setter down.However, during an initial portion of its stroke, the stop setter merelyapproaches the stop 34 without engaging same. During this initialmovement, the roller 61, cooperating with the cam 46, actuates the shiftlever 44 to swing the counterstop to the left of'the stop-settingstation, see Figure 5, after which the stop is set to effective positionto function as a right-hand or line-end stop. The leftward position ofthe counterstop 36 is defined by the engagement of lug 45 with the leftside of slot 48 in the cover plate. Upon release of the stop-setting key52, the spring 41 urges the counterstop 36 to its normal rightwardposition, shown in Figure 1, which position the counterstop assumes assoon as the right-hand margin stop is moved away from the stop-settingstation.

The slot 65 and spring 66' constitute. a yieldable mounting for thelever 64, directed to avoid dam-- age to the setting mechanismwhenpperated to set a right-hand stop with a. left-hand stop already inengagement, with the counterstop ifli, see Figure 13. In setting aright-hand stop/the initial movement of the key 52 brings the roller 61,into coaction with the cam' 46 to. swing the counterstop 36 leftward. ICounterstop movement, however, is obstructed by the left-hand marginstop, with the efiect that the shiftlever 44, is

the setting finger 54 merely idles over the set stop. As soon as key 52is released, the spring 66causes the parts toassume their normal,inactive position shown in Figure 1. To assure proper normal operationof the stop-setting mechanism itwill be understood that the spring 66 isto be amply strong to Withstand the reactionary forces of roller 61 .andcam 46 which tend to displace lever 64 endwise from .its normalrightward position, Figure 1. Spring 66 is therefore of suflicientstrength to overcome the force of spring 41 reacting throughthe cam androller A stop-restoring plunger Ill, shown best in Fig ures 2 and 3, isadapted to engage any one of the stops 34 positioned at the stopstation, to restore sameto ineffective position on the stop rack. Theupper end of the said plunger is slid ably retained in the cover plate50, just forward of. the counterstop 36 and has its lower end flexiblyconnected to an intermediate lever II, see Figure 1, pivoted at I2. Astop-restoring key 13 is carried on a key lever I4 pivoted at one end ona bracket I5, Figure 2, and includes a prong 16 overlying the free endof lever 'II. When the key I3 is depressed, the prong I6 movesdownwardly to swing lever II and thereby raise the plunger I to restorea stop. Upon release of key I3, a spring TI returns thestop-restoringmechanism to normal, inactive position.

The margin-release mechanism operates to retract the counterstop 36 toinefiective position out of the path of the carriage stops 34, and, toreleasably latch the counterstop retracted while the carriage is inbeyond-the-margin positions, the latching device being automaticallyreleased by return of the carriage to within the line-typing zone. Acounterstop retractor 80 is mounted for movement up and down, by meanshereinafter described, and has a dog 8I projecting laterally therefromand normally overlying a shoulder 82 on the counterstop 36. Anarm 83,forming part of a throw-01f device hereinafter described, is swingablymounted at its lower end on the pivot 38 and has a spring 84, anchoredto the shift lever 44, yieldably holding said arm in the normal,leftward position shown in Figure 1. As shown more clearly in Figure 14,a pin 85 on said arm is engaged in a slot in the. retractor 66. Thelower end of the retractor has a slotin which a pin 86 is engaged, saidpin being carried on a lever 81 fulcrumed 0n the stud 6|. A

spring 88, interposed between the retractor 86 and lever 87, holds thepin 86 normally against the upper n orth not; Lever sf arenas rightwardbeyond its pivot and has a spring 89,

acting thereon to yieldably hold the retrjactor so in normal; raisedposition. A margin-release key roller 94 may' seat when the cam assumesthe; several angular positionsof operation. The 111%" per part of thecam 95 presents a central tooth" 96 'is carried'on a key lever SIpivoted on the comb bar 56, said lever being engageable' at9? with the'lever8'I, Figure 2.

A roller 94, carriedon the counterstop 36', 'co-" operates with alatching-"eamfi rotatably car-'' ried on the shiftlever' 44. The cam 95has a series of faces w'ith'which the roll er 94 may en gage, includingacentral recess 96 and rightand" left side recesses 91, 98 into each ofwhich the m a fi t d le ie' b a .wriai m r r spaced insubstantialcorrespondence to the-re cesses 96,"9I, 98. With the rollerseateddn theina'fter described. H v u During the usual line typing between limits Hdefined by the set margin stops 34, the mechacentral notch 65, thecounterstop is projectedin the normal carriage-stop interceptingposition? and when seated in jeitherouter recess 91 or 98, thecounterstop is retracted out of the carriage" stoppath. The-outerrecesses are,'therefore, a' greater distance from the cam pivot than isthe Froni' this it will be Seen that the central recess. three recesses,regarded as a composite cam face, present a general contour issuingeocentrically each side of the cam center. The recessed form of the camcontour is employed to also obtain a detenting action of the roller 'onthe am to de tent the latter accurately at its several angularpositions, in each of minutes of the teeth I68,

, IIJI or I02 is adapted for engagement by-a set carriage stop.

The upper end of arm 83 carries a cam I63 presenting oppositely inclinedfaces which, in

cooperation with a pair of pins I64 on the latch ing cam 95, functionsas a throwoff device" to displace the counterstop retractor 83 at acertain; phase of operation, and thus throw the retract'o'r' Thisdisplacement of thea'ctuato'r 83 by cam I63also' dog 8| off thecounterstop shoulder 82.

serves to release the line-lock mechanism, herenisrn comprising thecounterstop and associated elements for margin release and stopselection maintain substantially the relative positions shown best inFigure 1, except that in banking at a line end, Figure 8, said mechanismis swung leftward en masse. The pivotal axis of the .cam on shift lever44, is substantially in alignment with the upper portion of thecounterstop so that the central tooth I00 of said cam is normallyaligned with the stop-engageable end of the counterstop when the cam 95is in its normal, non-released position, defined by the roller 94seating in the central recess 96. At said posi-v tion, the two pins I04engage the opposite inclined faces of cam I63, said cam being pressedagainst said pins by spring 84. Through the medium of the pin-and-slotconnection 85, they spring 84 also holds the retractor 83 in .itsleftward position defined by the engagement of cam I83 with the pinsI04,in which position the dog 8! overlies the counterstop shoulder 82.

The operation of the margin-release mechanism to free the carriage. fortypingin a lefthand margin, is shown in Figures 6 and 7. When s'uchvtyping is required, the carriage is usually; at the beginning-of-lineposition, Figure 6, with stop. It may be here noted that, after bankinglever fll countercloclrwiseq The pin 86 is, thusmoved' downwardly and;after bottoming in the slot, pulls the retractor 80 down. vThe dog 8|,being engaged with shoulder .82, retracts the counterstop 36 and theroller 94 is thereby withdrawnfrom theqcam recess 96 The mechanism thusassumes, the conditionshown in V dot-anddash outline in Figure 6, with.the counterstop 36 retracted, out of the carriage'stop path but with;

thecentral cam tooth I still in .the stop path. The carriageis-thenmoved rightwardly, preferably toits limitv ofmovement; and thestop 34 engages tooth-J00, rotating earn: 95 to a position in which theright-hand recessf ill is substantially aligned with. ro1le r,!-l4. v,While the cam is rotating, .,the.-upper pin. I04 coa cts with cam I03to, shift the retractor 80-,rightward', causing, thedog 8| to ride. offshoulder; 82 and release the counterstop. Th counterstop is thus freedto move upwardly under influence of spring 43 until arrested by theseating of roller 94 in the cam recess 81, which holds the counterstopretracted, at the same timedetentingthecam 95 in the margin-releaseposition, Figure 7. As-the dog 8| rides off the counterstop shoulder,spring 88 pulls the retractor farther downwardlyto the extent affordedby the pin-and-slot connection 86; ,so that the dog 8| is well below thelevel of the shoulder 82, thuspreventing a-possible reengagement ofthese; parts at anytime, as lon as the releasekey is held down, eventhough partly released.- .When the release key is released, theretractor 80 is raised to its normal elevation by spring 89, Figure 1,but is still held rightward free ofv the counterstop by pin I04 restingonthe high part of cam I03, as shown in Figure 7.

When the carriage is brought intothe normal line-typing zone, aftertyping'in the left margin,

themargin stop 34 is movedleftwardly by thiscarriage. movement andengages tooth I02 of the cam, The resultant rotation of cam 95 causesthe roller-84 to .ride over the high-point between recesses 9B andQ'I,against the-force of spring 43, until. said roller seats in the centralrecess 96, Figure 6, thus allowing the counterstop to rise to effectiveposition in the carriage stop path. In restoring cam v95 to its normal,non-released position, the upper pin- I04 rides off the high part of camI03 and allows the retractor 80 to be moved leftward by spring 84, tothus engage the dog ill with the counterstop, Figure 1.

When the carriage isfbanked at line-end position, the counterstop, andassociated elements are moved leftwardly to the Figure 8 position, atwhich the machine is locked against typing. In the illustratedembodiment, this line-locking'is effected by obstructing movement of theletterfeed universal bar, thereby disabling the letter. feed mechanism;although other well-known modes of line lockingmay be employed. As shownin Figures 2 and 3, alock lever I05 is pivoted on bracket 3'! to swinghorizontally. An arm of said lever extends rearwardly into a slot I06 ofthe retractor 80. A second arm extends forwardly, having its end I01normally, adjacent an arm I08 of the rockable bailZ'I. When theretractor 80 is in normal, quiescent position, Figure 1, or in aseacao ih n 9 3" 9 g t ma. rr drops .baclrafraction of a letter space to allowthe escapement mechanism .22. to again assume.

an operated position to theright thereof, the

lever end I0! is moved into abutting relation with arm,,l08, therebyobstructing movement of the universal bar.26 and preventing the typebars 20 from striking theplaten.

. The several stages of operation, in efiecting margin release from theline-end or right-hand.

margin position, are shownin Figures 8 to 11.

In Figure 8,. the banking of the carriage at the line end has shiftedthe counterstop and asso-, ciated elements leftward, the counterstop 36and shift lever 44 swinging about the pivot 38, thus further tensioningspring 41, the force of which holds the counterstop against the carriagestop. As the release .key 90 is depressed, the retractor 80 is pulleddownwardly, as previously described, drawing the counterstop with it tothe position shownin Figure 9,v at which the counterstop is about toride off the carriage stop, and the roller 94 is partly withdrawn fromthe, cam recess 95. When the counterstop does ride off the carriagestop, the parts snap to the position showniin Figure 10, actuated by thespring 41. Accordingly,

the counterstop 36 and shift lever 44 have assumed their rightwardposition against the plate.

50, butthe cam tooth I00, remaining engaged with the carriage stop, hascaused the cam 95 to be rotated initially by the rightward displacementof. the cam .pivot. This cam rotation has caused the lower pin I04 tocoact with cam I03 thereby swinging the retractor 80 rightward todisengage dog 8| from the shoulder 82 to free the counterstop, theroller 94 of which now presses against cam 95. It will be observed thatthe rightward displacement of the retractor, acting upon thelockinglever I05, has released the universal bar 26 and the machine isconditioned for further typing beyond the line end. During this furthertyping, the carriage stop 34 travels leftward and completes rotation .ofcam 95, so that the parts assume the Figure 11 position with the roller94 seated in the cam recess 98, and with the counterstop latchedretracted.

To restore the carriage for typing within the normal line-typing zone,the carriage is started in a return run, as shown in Figure 12. Thecarriage stop 34, proceeding from about the Figure 11 position, comesinto engagement with the cam tooth l0l, thereby rotating the latchingcam 95, which causes roller. 94 to ride over the high point between therecesses 96 and 98, the cam rotation continuing until the roller seats.in the central recess 96. This cam rotation carries the lower pin I04off the high part of cam I 03 and the retractor is accordingly releasedto its leftward position under influence of spring 84. Thus, theretractor dog 8| again engages the counterstopshoulder 82 and the partsare restored to the Figure 1 position for normal line typing.

Although in this application, there is specifically described oneembodiment which the invention may assume in practice, it will beunderstood that same is shown for the purposes of illustration, and thatthe invention may be modified and embodied in various other formswithout departing from its spirit or the scope of the appended claims.

I claim:

1. In a typewriter having a reciprocatory, carriage; a margin-gagingmechanism including;

at said point.

path of carriage-stop travel for engagement by said stops respectivelyto bar carriagetravel, in either direction, at said points; and meansfor movin holding and restoring the counterstop in respect to acarriage-stop engagement, said means including devices for withdrawingthe counterstop from the path of carriage-stop travel, for holding it sowithdrawn as the carriage passes beyond said points and until thecarriage is returned to a position in which the counterstop is inadvance of stop-engaging position, and for releasing and restoring (thecounterstop to stop-engaging position when said returned position hasbeen reached.

' '2. In a typewriter having a carriage movable in letter-spaceincrements, a margin-stop mech- 1 anism including a plurality ofuniformly-shaped selectively-settable' stops "arranged, slightly spacedin definite ratio to the letter-space increments, from approximately oneend of the carriage to'the other, any of the stops, when set forcarriage stopping, beingin alignment'with each other, counterstop meansarranged in relation to a set stop to bar carriage travel atja pointdetermined by the particular stop set, means adapted to eifect a changein the relationship between the counterstop means and the set stop,

irrespective of which of the plurality of ,settable stops has been set,to permit movement" of the carriage beyond said point; and means,operable in consequence of return of the carriage from be- "yond saidpoint, and irrespective of which of the plurality of settable stops'hasbeen set, to againset up a relationship between the counterstop meansand the set stop to bar carriage travel 3. In a typewriter having acarriage movable in letter-space increments, a margin-stop mechanismincluding a plurality of stops arranged, slightly spaced in definiteratio to the letterspace increments, from 'approxirnately one end of thecarriage to the other and selectively settable in alignment with eachother to'define th'etwo margins, counterstop vmeans arranged in relationto any two of said stopsset on opposite sides thereof to bar travelofthe carriage at ;points determined by the setsto'ps, means adapted toeifect a change in the relationship betweenthe counterstop means and oneof thefsetstops to permit movement of the carriage beyondthecorresponding one of the points, and means operable in consequence ofreturn of the carriage ffr'o'm beyond said one point to restore therelationship between thecounterstopmeans andsaid one set stop to barcarriage travelat the saidforielpoint.

"*4. In a typewriter having a carriage movable in letter-spaceincrements, a margin-stop mech- 'anisrn including a pluralityof'se'lectively settable stops arranged respectively atletter-spa'ceintervals from approximately one 'endofthelca'r- "riage to the other, asingle counterstop adapted forarrangement between any two set stops'tocooperate ,With the confronting faces of the'two s et stops,respectively, in the same uprightplane of carriage travel, to determinea normal range 'of carriage travel which may be varied at will -;by thesetting of different stops, means adapted toeifect a change in therelationshipbetween the counterstop and one'of the set stops to permitmovement of th carriagebeyond the normal Grange of travel, and meansoperable in consequence' of return of the carriage to within'the normalrange of travel to"restore the original ..rela-tionship between theisaid"(m e Stop and the counterstop. y

5. In a typewriter having a carriage movable in letter space increments,a margin-stop mech- 'anism including a group of stops near eachcarriage'end, the stops ineach group being uniform 5 and-arranged atslightly spaced intervals and being selectively settable to identicaleffective position in alignment witheachother, counterstop meansarranged inrelation to stops set re- "spectively in each of said endgroups, and on opposite sides of said counterstop means, to bar travel'of the carriage at points determined by the set 'stops, means adaptedto effect a change in the relationship-- bet v'veen thecounterstop meansand either of the set stops to permit movement of the carriage beyondeither point, and meansrop'erable in consequence of return of the"carriage past the point determined by the corresponding stop, torestore the relationship between the counterstop'means and thecorrespond- 1m; 'set stop to bar carriage travel at the said point. v 6.In a typewriter having a carriage movable in letter-space increments anda rack on the f carriage containing a series of slidable stops arrangedat definite intervals from approximately one end of the carriage to theother, key-operable means for selectively setting said stops to presentone" ori each sideof a counterstop to define a normal-typing range,acounterstop norf nally held in the path of the set stops on thecarriage, key-controlled means for Withdrawing the counterstop from saidpath to allow move: ment of the carriage in either direction beyond"said normal typing range, means to latch said counterstop withdrawnduring carriagemovement beyond thesaid range, and means operable uponreturn of the carriage to Within said range,--to unlatch the counterstopfor resetting -it in the path of the set stops' onthe carriage.

40 7. A marginstop-mechanism'for a typewriter having a reciprocatory,letter-feed-controlled carriage, comprising in combination, a pluralityof identical stops at letter-spaced intervals on the carriageselectively set table in alignment with each other, any two set stopsbeingadapted to define a typing rangebetween normal line ends; a'singlecounterstopnormally-in the path of the two set-stops-to'gagethenormal line ends 'in'tr'avel of the carriage,"means-todisengage the"counterstop and the set stop with which it has engaged, to permitadditional carriage travel for typing beyond the" line end defined bytheengaged stop; and means operable in consequencelief-restoration ofthe carriage to within the normal typing range, to restore the saidsetstop "and counterstop to normal relation. 1 8. A mnargin-stop .mechanismfor; a typewriter having a reciprocatorycarriage, comprising incombination, a plurality'of identical stops at letter-spaced intervalson the carriage selec- 'tivelysettable todefine a typingrange betweennormal line ends, a single counterstop normally "efiective to engage asetcarriage stop to gage a nh'ormal" line "'end, means for] rendering.said counterstopinefiective to permit additional car "ria'gej travel'fortypihg'beyond' the normal line end, and -meanjs for r'leasablyretaining the 'coun'ters'top inefie ctive during said additional"carriage travel, said retainingmeans being engage'able and actuable bythe set stop and endered effective or ineffective by'relative move-'-'-mentfof the set stop and counterstop in appro- I "priate direction,

9. A'marginstopme chanism for a typewriter having a .reciprocatory'carriage, (comprising, in

- combination, a'stop on-the carriage, a counter- -stop'normallynrged toeffective position to' en- *gagethe' carriage stop for gaginga normalline end? of carriage travel, key-operable means for I I movingthe'counterstop to clear the carriage stop to ;permit:.additinalcarriage travel for typing --bey0ndthe normal line end, and means forre- 7 leasably holding the counterstop so moved, duringesaidgadditionalcarriage travel, saidholding, '-.means being engageable and actuatablebythe carriage stop-rendered effective by carriage-stop cmovement inone-direction and renderedineffec- -.tive bycarriage-stop movement inthe opposite .Zdirection; l L v v {1'0 A:.;.margin-stop mechanism for atype- -,writer'having a reciprocatory carriage, comprising,inscombination, a stop on the carriage, aretractable counterstopnormally urged to effectiveposition to engage the carriage, stop forgaging a normal line end of carriage travel, means for. retracting thecounterstop to clear the carriage stop to permit additional carriagevtravel in one direction for typing beyond thenormal line end, and alatching device engageableand rendered effective by the carriage stopduring said j additional carriage travel,, to latch the counterstopretracted, and engageable and rendered inefiective by the, carriage stopin carriage travel in the opposite direction, to automatically releasethe counterstop for return to efiective position. v I o 5 ll. Amargin-stop mechanismior a typewriter having a reciprocatorycarriage,-comprising, in combination, a stopon thecarriage,,aretractable permit additional .carriagatravel in onedirection ucounterstop normally urged to effective,position to engage the carriagestop f0r;gaging a normal line end'of carriage travel, means ,forretracting the counterstop to clear. the vcarriage stop to for typingbeyond the normal line end, and a p vo d .l tch nsismem e ngableinop osdirections; in a plane, of carriage travel upon engagement ofqthecarriage stop therewith, to

latchthe counterstop retracted during said ad-,

,ditional carriage travel and, during carriage having a reciprocatory,

travel in theopposite direction, .to release, the

.i flunterstopifor' return to effective position,

12. 'A- margin-stop mechanismior a typewriter carriage, comprising in-combination, marginaging stops on the carriage defininga typingrangebetween normal line, ends, a retractable counterstop normally urgedto stop-intercepting ,position for gaging the normal line ends key-r.

operable means to retract the,counterstop to permit additional carriagetravel for: typing, be-

. yonda normal line end, a rotatable cam actuatable by ,the carriagestops and operative, upon relative stop and counterstop movement in onedirection, to hold the counterstop retracted, said cam being actuatableto free the counterstop for restoration to stopintercepting position,upon 5 relative movement of thestopsand counterstop counterstop, 'arotatabl'efcam' having aseri'es of faces on which said'follower isseatable, the faces' inlan opposite direction.

; 13 A margin-stop mechanis rnjfon a typewriter having a reciprocatory,carriage, comprising, in combination, a stop ,on thecarriage, a retractable counterstop normally: urged to eifective position to interceptthe carriage stop for gaginga normal, V 70 line end of carriagetravel,means for retracting the counterstop toclear the carriage, stopto permit additional carriage travel tor typing beyond the normal line,end, a cam follower onsaid letter-feed controlled 1 assgtgq beingdifferently'spacedrrom the cam axisto gage 'thefcounte'rstopatstOp-cIearing and stopintercepting positions, said cam having portionsengageable by the carriage stop in reciprocatory ,carriage' travel, torotate the cam to the different counterstop-gaging positions.

14'. A margin-stop mechanism for a typewriter having a reciprocatorycarriage, comprising in combination, margin stops'on the carriagedefining 'a typing range between normal line ends,

a retractable counterstop normally urged to stopintercepting position,normally efiective keyop'erable means for retractingthe counterstop fortyping beyo'ndthe normal line ends, releasable latching means engageableby the carriage stops andfoperative upon relative stop andcounterdisable said retracting means, said disabling 'means,'uponrelative stop and counterstop movement in an opposite direction, beingrendered ineffective, to recondition said retracting means forjcounterstop retraction.

15'. A margin-stop mechanism for a typewriter having areciprocatoryc'arriage, comprising'in combination, margin stops on thecarriage defining a typing range between normal line ends, a retractablecounterstop normally urged to "stop-intercepting position, normallyeffective key-operable means for retracting the counterstop to permittyping beyond the normal line ends, releasable latching means engageableby the carriage stops and operative upon relative stop and counterstopmovement in one direction after stop interception, to latch thecounterstop retracted, and means operable by said latching 'means inlatching the counterstop, to disable said retracting means, saidlatching means, upon relative stop and counterstopmovement in anopposite direction,- being releasable to free the counterstop forrestoration and render said disablin'gmeans ineffective.

16. A margin-stop mechanism for a typewriter having a reciprocatory,letter-feed-controlled carriage, comprising in combination, margingagingstopson the carriage defining a typing range between normal line ends, aretractable counterstop normally urged to, stop-intercepting positionfor gaging the normal line ends, a keyoperable retractor adapted forcoupling with the counterstop, normally urged to coupled 'rela-"tiontherewith and operative to retract the counterstop to permitadditional carriage travel for typing beyond a normal line end,releasable latching means engageable by the carriage stops and operativeupon relative stop and counterstop movement in one direction,forlatchingthe counterstop retracted, and] means ,operablejby saidlatching means to'juncouple said vr ac 1 from thecounterstop and'therebyfrelease the i counterstop. to control ofthe latching means; saidlatching means being releasable to free the counterstopsfor restorationto stop intercepting position, upon relative stop and-gcounterstopmovementv in an opposite direction; in restoring ,Qthecarriage to withinthenormal typing range.

a having a reciprocatory, letter-feed -controlled =17." A mar'gin-st pmechanism for aitypewriter carriage, comprising in combination, margin-,aesasgo gaging stops on the carriage defining a typing rangebetweennormal line ends, a retractable counterstop normally urged tostop-intercepting position for gaging the normal line ends, akeyoperable-retractor adapted for coupling with the counterstop,normally urged to coupled relation therewith and operative to retractthe counterstop to permit additional carriage travel for typing beyond aline end, a rotatable cam actuatable by the carriage stops and operativeupon relative stop and counterstop movement in one direction, to holdthe counterstop retracted, and means operable by said cam to uncouplesaid retractor from the counterstop and thereby release the counterstopto control of the cam, said cam beingactuatable to free the counterstopfor restoration to stop-intercepting position, upon relative movement ofthe stops and counterstop inian opposite direction in restoring thecarriage to within the normal typing range.

18. A margin-stop mechanism for a typewriter having a reciprocatorycarriage, comprising, in combination, a plurality of identical stops atletter-spaced intervals on the carriage, selectively key-settable at astation to define a normal typing range between normal line ends, aretractable counterstop normally urged to carriage-stop-interceptingposition to gage a normal line end, means mounting said counterstop forshifting in the direction of carriage travel, between limits defining anormal position to the right of said stop-setting station and a shiftedposition to the left of said station, means yieldably holding thecounterstop in the normal rightward position, means to retract thecounterstop to stop-clearing position to permit additional parriagetravel for typing beyond. the normal line end, and means engageable andactuatable by a set carriage stop to latch the counterstop retractedduring said additional travel, and en-. gageable and releasable by a setstop in carriage travel to within the normal typing range, toautomatically release the counterstop to effective position.

19. A margin-stop mechanism for a typewriter having a reciprocatory,letter-feed controlled carriage, comprising in combination, a pluralityof identical stops at letter-spaced intervals on the carriage,selectively key-settable at a station to define anormal typing rangebetween normal line ends, a retractable counterstop normally urgedtocarriage stop-intercepting position to gage anormal line end, meansmounting said counterstop for shifting in the direction ofcarriagetraveLbetween limits defining a normal position to the right ofsaid stop-setting station and a shifted positionv to the leftv of saidstation, means yieldably holding the counterstop in the normal rightwardposition, means to retract the counterstopto stop-clearing position topermit additional carriage travel for typingbeyond the normal line end,and a latching, device carried on said ,m ounting means andengageableand actuatable by a set carriage stop to .latch the'counterstop retracted during said additional ,travel, and engageable andreleasable by a set 20. A margin-stop mechanism for a typewriter stopsetting. I

counterstopnormally urged to. carriage stopintercepting position togagea normal; line end, means including 'ashift gmember mountingvsaidcounterstop for shifting in the direction ,ofcarriage travel, betweenlimits defining a normal position to the right of said stop-settingstation and a shifted position to the left ofsaid station, meansyieldably holding the counterstop inqthe normal rightward position,means to retract-the counterstop to stop-clearing position to permitadditional carriage travel for typing beyond the normal line end, and alatching device carried onsaid shift member and engageableandtactuatable by aset carriagestop to latch the counterstop retractedduring said additional travel, and engageable and releasable by a setstop incarriage travel to within the normaltyping range, toautomatically release the counterstop to effect p t n u 21, Amargin-stop mechanism fora typewriter having a reciprocatory,letter-feed controlled carriage, comprising in combination, a plurality.of identical, settable stops at letter-spaced intervals on thecarriage, key-operable means .to set any one of said stops, positionedby carriage movement, at a stop-setting station, a retractable,counterstop normally urged to carriage stop-intercepting position togage a normal line end, means including a shift lever mountingsaidcounterstop for shifting in the direction of, carcounterstop tostoprclearing. position to permit additional carriage travel for typingbeyond the normal lineend, and means carried on said shift lever {toreleasably hold the counterstop retracted and actuatable by a set stop,to be rendered effective or ineffective thereby, depending on thedirection of stop movement, saidkey-operable means including a pair ofkeys and meansoperable by one of I saidkeys to actuate. said shift leverto move the counterstopleftward prior to 22. A marginestop mechanism fora -typewriter having a reciprocatory, letter-feedecontrolled carriage,comprising, in combination, aplurality of identical, settable stops 7 atletter spaced intervalson the carriage, key-operable means to set anyoneof said stops, positioned by carriage movement, at a stop-settingstation, asingle counterstop normally effective toengage a set carriagestop to gagea normaLlineend; means inc udin a shift lever mountingsaidcounterstop for shifting in-eth e direction of, carriagetravel,

. rightward positiomsaid key-operable means inhaving a reciprocatory,letter-feed controlled carriage, comprising in combination, a pluralityof identical stops at letter-spaced intervals on the carriage, keyesettable at a station to definea typine ange betw m rma lin -finds aretra tab cludingapairof keys, associated actuating. levers .;-and acam-and-follower ,clevice operable by the .lever of one of said keys'toactuate saidshift vciated therewith allowing said cam-and-follower toidle "although-said, shift levernisqblocked against movement,

23-. A margin-stop mechanism ,for'a typewriter having a reciprocatQry,letter-feedecontrolled set any of said stops, positioned by carriagemovement, at =astop-setting station, for gaging the normal right andleft line-ends, a retractable "counterstop normally urged to position tointer- =cept the set stops, means including a shift mem- =ber mountingsaid counterstop for limited shifting 'in the direction of carriagetravel to opposite sides of said setting station, means yieldablyholding the counterstop at one side of said station, a key-operableretractor adapted for"coupling with the counterstop and normally urgedto coupled relation'therewith and operative to retract the counterstopto permit additional carriag travel for typing beyond a normal line end,

l counterstop latching means carried-on said shift member'gengageable bythe set stops and operative t'o l'a'tch the counterstop retracted, after"stop interception and upon relative movement of the stop and thecounterstop with the shift member, following counterstop retraction,means operable by said latching means to uncouple the retractor from thecounterstop and thereby "release the counterstop to Control of saidlatching-means, said latchingmeans being releasable to free thecounterstop for restoration to stopintercepting position, upon movementof the stops in a direction opposite that-by which the latching means isfirst rendered operative;

7 24; A'margin-stop mechanism for a typewriter liaving a reciprocatoryletter-feed-controlled carriage, comprising in combination, a'pluralityof letter-spaced stops on thecarriage; means'to set any-of said stops,positioned by carriage movement, ata stop-setting station, for gagingthe normal right and left line-ends, a retractable counterstop normallyurged toposition to intercept the set stops, means including ashift'member mounting said counterstop for limited shifting in thedirection of carriage travel to opposite sides of said setting station,means yieldably holding the counterstop at one side of said station, akey-operable retractor adapted for coupling with the counterstop andnormally urged to coupled relation therewith and operative to retractthe counterstop to permit additional carriage travel for typing beyond anormal line end,

a rotatable cam carried on said shift member, engageable'by the setstops and operative; to hold the counterstop retracted, after stopinterception and upon relative movement of the stop and the counterstopwith'the shift member, following counterstop retraction, -means operableby said cam to uncouple the retractor from the counterstop andtherebyrelease the counterstop to control of said cam, said cam'being operableto free the counterstopfor restoration to stop-intercepting position,upon movementofthe stops in a direction opposite that bywhich thelatching -means-is first'rendered operative. l r

25. Amargin-stop mechanism for atypewriter 1 having a reciprocatory,letter feed controlled carriage, comprising in combination, a pluralityof letter-spaced stops on the carriage, key-operable means toselectively set any of said stops, positioned by carriage movement, at astop-setting station, for gaging the normal right and means yieldablyholding the tively operable, means operable by said setting means whenoperated selectively, to shift said member leftward prior to setting astop for gag- --ing a right'lin'e end, a key-operable retractor adaptedfor coupling with' the counterstop, normally urged to coupled relationtherewith and operative to retract the counterstop to permit additionalcarriage travel for typing beyond a normal line end, counterstoplatching means carriedon said shift member, engageable by the .setcarriage stops and rendered effective to hold the. counterstopretracted; after stop interception and. upon stop movement rightward orcounterstop and'member movement rightward, following u counterstopretraction, and means operable by said latching means to uncouple theretractor from the counterstop and thereby release the counterstop tocontrol of said latching means, said latching means being releasable tofree the counterstop for restoration to stop-intercepting position, uponmovement of the stops in a direction opposite that by which the latchingmeans is rendered effective.

'26. Inv a typewriting machine having typing instrumentalities, aletter-feed-controlled, re-

ciprocatory carriage and a line-lock device for disabling the typinginstrumentalities; a marginstop mechanism comprising, in combination, a

- series of letter-spaced stops on the carriage, settable atastop-setting station, for gaging the normal line ends, 'a retractablecounterstop normally .urged to stop-intercepting position, meansincluding a shift member, mounting said counterstop for shifting betweenlimits defining a normal position to the right of said stop-settingstation and a shifted position to the left of said station, meansyieldably holding the counterstop in the normal rightward position, akeyoperable retractoroperatively connected to the line-lock 'device andadapted for coupling with the counterstop, being normally urged tocoupled relation therewith, the line-lock device being 'inefiectivewithsaid retractor coupled and the counterstop in normal rightward position,leftward travel and interception of a set stop by the counterstopcausing shifting of the counterstop and retractor to :operate theline-lock device, releasable latching means carried on said shift memberand actuatable bythe set carriage stops to latchthe counterstopretracted after operation of the retractor, an'dmeans operable by saidlatchingmeans to uncouple the retractor and thereby. release theline-lock device and free the counterstop to control of the latchingmeans,

said; latching means being releasable to free the .ic'ounterstop for;restoration to stop-intercepting position and-to allow recoupling of theretractor, upon movement of the effective, set stop in a rightwarddirection of'carriage travel.

2'; A margin-stop mechanism for a typewriter having a'reciprocatorycarriage, comprising, in combination, a plurality of letter-spaced stopson the carriage, key-operable means to set any of said'stops',positioned by carriage movement, at a stop-setting station, for gagingthe normal right and left line ends, a retractable counterstop normallyurged to position to intercept the set stops, means'including a shiftmember mounting said counterstop-for shiftingbetween limits defining anormal position to the right of said stop-setting station and a shiftedposition to the left ofgsaid station, means yieldably holding thecounterstop in said normal, rightward position,

' sai'd' ky operable setting means including a pair of keys and'meansoperable by'one of said keys to shift said member leftward priorto setting a stop for gaging the right line end, a key-operableretractor adapted for coupling with the counterstop, normally urged tocoupled relation therewith and operative to retract the counterstop topermit additional carriage travel for typing beyond a normal line end,latching means carried on said shift member, engageable by the set stopsand rendered effective to hold the counterstop retracted, after stopinterception and upon stop movement rightward or counterstop and shiftmember movement rightward, following counterstop retraction, and meansoperable by said latching means to uncouple the retractor from thecounterstop and thereby release the counterstop to control of saidlatching means, said latching means being releasable to free thecounterstop for restoration to stop-intercepting position, upon movementof the stops in a direction opposite that by which the latching meanswas rendered effective.

28. A margin-stop mechanism for a typewriter having a reciprocatory,letter-feed-controlled carriage, comprising in combination, a pluralityof letter-spaced stops on the carriage, means to set any of said stops,positioned by carriage movement, at a stop-setting station, for gagingthe normal line ends, a counterstop normally urged to stop-interceptingposition, means mounting said counterstop for endwise retractivemovement transversely of the direction of carriage travel and forpivotal movement in the direction of carriage travel, a pivoted shiftmember slidably guiding said counterstop, means including said shiftmember for limiting counterstop pivotal movement between a normalposition to the right of said stop-setting station and a shiftedposition to the left of said station, means acting on said shift memberfor yieldably holding the counterstop in the normal rightward position,a key-operable retractor mounted for oscillatory movement to and fromthe counterstop and endwise movement with the counterstop, saidretractor having a part engageable with the counterstop to retract thelatter to stop-clearing position for typing beyond a normal line end,means urging said retractor to counterstop engagement, a rotatable camon said shift member, engageable and actuatable by the set carriagestops and adapted, in moved position, to hold the counterstop retracted,and a cam fixed on said retractor, said rotatable cam having aprojection cooperative with said fixed cam to swing the retractor out ofcounterstop engagement when the rotatable cam is actuated to movedposition, to thereby release the counterstop to control of the rotatablecam, said rotatable cam, upon return of the carriage from beyond anormal line end, being returned from moved position by the associatedcarriage stop to release the counterstop to effective position and torelease the retractor for counterstop reengagement.

29. A margin-stop mechanism for a typewriter having a reciprocatory,letter-feed-controlled carriage, comprising, in combination, a pluralityof letter-spaced stops on the carriage, key-operable means to set any ofsaid stops, positioned by carriage movement, at a stop-setting station,for gaging the normal line ends, a counterstop normally urged tostop-intercepting position, means mounting said counterstop for endwiseretractive movement transversely of the direction of carriage travel andfor pivotal movement in the direction of carriage travel, a pivotedshift member slidably guiding said counterstop, means including saidshift member for limiting counterstop pivotal movement between a normalposition to the right of said stop-setting station and a shiftedposition to the left of said station, means acting on said shift memberfor yieldably holding the counterstop in the normal rightward position,a key-operableretractor mounted for oscillatory movement to and from thecounterstop and endwise movement with the counterstop, said retractorhaving a part engageable with the counterstop to retract the latter tostopclearing position, means urging said retractor to counterstopengagement, a rotatable cam on said shift member, engageable andactuatable by the set carriage stops and adapted, in moved position, tohold the counterstop retracted, a cam fixed on said retractor, saidrotatable cam having a projection cooperative with said fixed cam toswing the retractor out of counterstop engagement when the rotatable camis actuated to moved position, to thereby release the counterstop tocontrol of the rotatable cam, said rotatable cam, upon return of thecarriage from beyond a normal line end, returned from moved position bythe associated carriage stop to release the counterstop to effectiveposition and to release the retractor for counterstop reengagement, saidstop-setting means including means operable on said shift member toshift the counterstop to its leftward position prior to setting of astop at the right of the counterstop.

WILLIAM F. HELMOND.

